The disclosure relates to a fixing mechanism for fixing a component. The fixing mechanism includes a base, a bottom wall disposed on the base, and two lateral walls disposed on the base and connected to the bottom wall. A containing space is formed between the base, the bottom wall, and the two lateral walls. The fixing mechanism further includes a hook. The hook includes a cantilever portion and a hooking portion. The cantilever portion is connected to the bottom wall and for pressing against the component when the component is contained inside the containing space. The hooking portion is connected to the cantilever portion and engages with a lateral surface of the component when the component is contained inside the containing space. The fixing mechanism further includes two engaging parts for laterally engaging against the component when the component is contained inside the containing space.